Every stair calculator on the site, in one place

The full planner: total rise, total run, angle and step count from your target dimensions. Owns the multi-input planning query.

The build output: notch points, mount type, cut list and PDF/SVG diagram from a finished design. Owns the 'ready to cut' query.

Single-answer tool for the isolated 'how many steps do I need' query — ranks independently of the full planner.

Single-answer slope-in-degrees tool with comfort-range warnings.

Single-answer exact, code-uniform riser height across the flight.

Single-answer minimum and comfortable tread depth for a given rise.

Clearance from nosing to ceiling, now including the IRC/IBC pass-fail check. Most commonly failed code item on basement stairs — bumped to Phase 1 on that evidence.

Overhang length and effective tread depth with nosing included.

Minimum clear stair width for residential vs commercial use.

Merged tool: runs the 7-11 rule, 2R+T rule, and Blondel formula against the same inputs in one comparison table instead of three thin pages.

Tread rotation, center pole diameter, and headroom for a spiral stair.

Outdoor stringer layout accounting for ground slope and open risers.

Pie-shaped winder tread geometry — the trig used inside any turning staircase, kept standalone since the math is genuinely distinct.

90° turn layout with an on-page toggle for landing vs winder-tread construction — absorbs the former Quarter-Turn calculator.

180° turn layout with an on-page toggle for landing vs winder-tread construction — absorbs the former Half-Turn calculator.

Freeform curved stringer geometry and radius-based tread sizing.

Cantilevered tread spacing, support depth, and open-riser sightlines.

Multi-flight parallel layout for tall commercial/industrial vertical rises — distinct from U-shaped by flight count.

Steep-space stair layout for utility and loft access.

Folding or fixed ladder sizing for attic and loft access.

Layout for confined-height basement stairwells, cross-linked to the headroom calculator.

Weather-adjusted rise and run for uncovered outdoor stairs.

Short-run entry step sizing from porch to grade.

Sloped-ground step and landing spacing for garden paths.

Submerged step depth and tread sizing for pool entries.

Maximum center-to-center stringer spacing for a given tread material and load — flags when the result requires a third, center stringer, absorbing the former Center Stringer Calculator (that question is just this calc's output at wider stair widths).

Maximum span for the beam carrying a stair landing or top platform.

Structural joist size and spacing for a stair landing platform — distinct from Landing Size Calculator, which checks code-minimum dimensions, not framing.

Concrete footing dimensions for exterior and deck stair posts.

Fastener count and spacing for attaching a stair ledger to a rim joist.

Number of hangers needed for a landing or stair platform frame.

Live load capacity check against residential and commercial minimums.

Concrete volume, bag count, and form sizing for solid concrete steps.

Rebar quantity and spacing for reinforced concrete stairs.

Full lumber sizing and grade selection for a wood-framed staircase — the comprehensive planner.

Quick board-count tool for a known stringer design — re-filed here from Finishing since it's a structural quantity, not a finish. Distinct from the Wood Stair Calculator's full planning scope.

Steel stringer weight, plate thickness, and weld length for a steel stair.

Pan tread depth and concrete fill volume for steel pan stairs.

Paver and mortar quantity for brick or paver garden steps.

Block count and fill for a cinder block step foundation.

Stone slab sizing and base depth for flagstone or slab steps.

Board count and fastener spacing for composite deck stair treads.

Timber count and spike sizing for railroad-tie garden steps.

Board footage of finish tread and riser stock for the full flight — the walking surface, not the frame beneath it.

Carpet yardage for treads, risers, and landing with pattern allowance.

Total runner length and per-step cut allowance.

Coverage area and can count for painting or staining a staircase.

Length and angle cuts for the finish skirt board along an open stringer.

Tile count for treads, risers, and landings with cut waste factored in.

Vinyl plank and nosing quantity for stair-specific installation.

Linear footage of stair-nose edge trim, a distinct SKU from riser and baseboard trim — now with a material toggle for decorative trim vs anti-slip strip, absorbing the former Anti-Slip Strip calculator (same "linear footage along the nosing" job either way).

Baseboard length along a raked stair wall.

Riser cap and trim quantity for a full flight.

Full material list: posts, rail, balusters, and fasteners.

Even spacing that meets the 4-inch sphere rule, now returning total baluster count alongside the spacing — absorbs the former Baluster Quantity Calculator, which was just this tool's spacing output run in reverse.

Code-correct handrail height measured from the nosing line.

Newel post height and placement at winders and landings.

Minimum guard height for open stair and landing edges.

Cable count and tension spacing for a cable stair railing.

Panel count and sizing for a glass stair balustrade.

Audits a full design (width, headroom, handrail, guard, landing) against IRC — distinct from Rise & Run's soft comfort warnings.

Checks tread, riser, and handrail dimensions against ADA 505.

Maximum ramp run and landing spacing for a given rise.

Commercial stair limits under the International Building Code.

Rise, going, and pitch limits under UK Approved Document K — near-zero direct competition, second geography. Holds real promise but needs UK keyword-volume confirmation before it earns a launch slot.

Minimum code landing depth and width — dimension check only, not framing (see Landing Framing Calculator).

Minimum egress width scaled to building occupant load — covers both residential egress and commercial occupancy cases in one tool, absorbing the former Commercial Occupancy Egress Width Calculator (same input, same output).

Rise, run, and width limits for exterior fire escape stairs.

Total installed cost from materials, labor, and finish level.

Materials and labor cost for outdoor deck stairs.

Cost to reface, recarpet, or rebuild an existing staircase.

Material and labor cost by railing type: wood, cable, glass, iron.

Side-by-side cost comparison for two common stair finishes.

Pour cost per step for concrete stairs, formed or precast.

Kit price range by diameter, material, and rise.

Installed cost for a straight or curved stair lift.

Breaks a stair budget into labor and material shares.

Cost to sand, stain, and refinish existing wood stairs.

LED strip length and driver sizing for under-nosing stair lighting.

Padding yardage to go under a stair runner.

Usable cubic footage in the void beneath a staircase.

Rail length needed to cover a given stair run.

Checks if a given item will clear your stairwell turn and headroom.

Rough floor opening length needed, driven by required headroom clearance — confirmed as a real distinct tool type in research.

Quick layout for job-site temporary stair access.

Rise and run sized for small-pet stairs or ramps to furniture or vehicles.

Checks opening width against standard and extra-wide gate sizes.

Converts stair angle in degrees to a slope percentage.

Quick imperial-metric conversion for all stair dimensions.

Converts a rise-run ratio directly to an angle in degrees.

Side-by-side reference between roof pitch and stair angle notation.

Generic linear-feet-to-board-feet conversion utility — distinct from the project-specific 2x12 Stringer Board and Tread/Riser Material calculators.

Converts concrete stair volume between cubic feet, yards, and meters.